Evaluation of human cellular immune function in echinococcosis

Area of Science:

• Immunology
• Parasitology
• Cellular Biology

Background:

• Hydatid disease, caused by Echinococcus granulosus, poses a significant global health challenge.
• Understanding the host immune response is crucial for diagnosis and treatment of parasitic infections.
• Cellular immunity plays a vital role in controlling parasitic diseases, but its specific role in hydatidosis requires further elucidation.

Purpose of the Study:

• To investigate the specific and nonspecific cellular immune status in individuals with hydatid disease.
• To assess the effect of hydatid antigen on in vitro lymphocyte proliferation.
• To compare immune responses between patients with hydatid disease, non-hydatid disease, and healthy controls.

Main Methods:

• In vitro blast transformation assay was employed to evaluate cellular immune function.
• Forty-nine individuals were studied: 11 with hydatid disease, 23 with non-hydatid disease, and 15 healthy controls.
• Lymphocyte proliferation was measured in response to phytohemagglutinin (PHA) and hydatid antigen.

Main Results:

• Patients with hydatid disease exhibited suppressed cellular immune function to PHA compared to controls.
• Hydatid antigen inhibited in vitro blast transformation at concentrations of 0.1 microgram protein/ml and above.
• This inhibitory effect of hydatid antigen was observed across all study groups, regardless of hydatidosis status.

Conclusions:

• Hydatid disease is associated with impaired cellular immune responses.
• Hydatid antigen demonstrates immunosuppressive properties, inhibiting lymphocyte blastogenesis.
• The findings suggest a potential mechanism for immune evasion by the parasite in hydatidosis.